Friction-held alarm-switch.



F. R. ALPGRD.

FRIGTION HELD ALARM SWI'IGH.

APPLIGATION FILED MAR. l4l 1908.

Patented Nv.3,190s.

lullmnln UNITED sTATEs PATENT oEEIcE.

FRANK R. ALFORD, OF WINSTED, CONNECTICUT, vASSJGNOR TO WM. L. GILBERT CLOCK COMPANY, OF WINSTED, CONNECTICUT, A CORPORATION OF CONNECIICUT.`

FRICTION-.HELD ALERTE-SWITCH.

specification fmetzemrateat.

.Patented Nov. 3, 19118.

Application led Hatch 14, 1908. Serial No. 421,032.

` necticut, have invented certain new and use? ful Improvements in Friction-Held Alarm- Swltches, of which the following is a full, clear, and exact description.

My invention relatesl to the alarm'mechanism of so-called alarm vclocks,yand isv concerned particularly with an improved switch for rendering :the alarm inoperative when desired. X i

Thev object of the invention is to provide means for preventing accidental displacement of the switch from its operative ath; to hold the switchin all positions o adj ustment, and to limit themovementthereof to itsefective ath of operation.

l With these o jects inv view, the invention consists in the construction and arra ement of parts, the preferred embodimento which is illustrated in the accompanying drawings, in which l Fi ure 1 is a rear view of an alarm clock, the a arm bell being removed for clear'illustration. Fig. 2 is a partial sectional view of 'the interior of the clock,'the works'being removed to clearly show the mounting of the alarm hammer.- Fig. 3 is a sectional view on the line 3--3 Fig. 1. Fig. 4 is a detail of parts hereinafter to be described.

In the embodiment of my invention here. selected for illustration, the alarm bell -1 is shown as mounted upon the rear of the clock and supported thereon in any desirable manner. T e alarm hammer 2 is carried by an arm 3 pivoted upon a pintle 4 in convenient operative position with respectto the usual hammer actuating mechanism (not shown). The hammer arm 3, as shown in Figs. 1 and 2, projects through a suitably shaped opening 5 in the back plate y6 of the clock, and

upon said back platev is mounted the switch 7, which, as here shown, is constructed in 'the form of an arm, preferably pivoted at 7 at the center of the back and extending radially thereof adjacent the path of the hammer arm 3. l

In order to prevent the switch from being displaced from its operative path, by being accidentally pulled or bent away from the back plate 6, a iin 'er 8 is provided which may be struck up rom the material of the back and overlies the free end'of the arm,

as clearly illustrated in 1. "In order to hold the switch firmly in adjustedposition, the finger 8 is provided with a friction rib 9' extending longitudinally thereof,

which bears upon the arm and holds it 60 firmly down. against the back. `For convenient manipulation of the switch l arm the outer end thereof may be bent over the peripheral ridge 10 of the back plate, as shown at 11, Figs. 1 and 3. To limit the swing of the switch arm within its effective operative path, the attached portion of thev holding finger 9 is positioned so as to-engage the arm when moved to the limit ofits inoperative position, thereby forming a stop `or guard.v for ymovement. of the arm. To

limit the movement in the opposite direction, the arm may be formed with acurved portion 12 arranged to engage one of the studs 13 which serves to secure the parts of the clock in assembled position. When the switch-is in the stopping position this curved portion thereoflies directly across the path of the hammer arm whereby the latter is the more effectively stopped by engagement therewith.

The preferred -method of mountin the switch arm here illustrated consists in rawing up the inner end thereof to form a rivet 14 (Fig. 3), which may be upset within an aperture in the center of the back, thus leaving an unobstructed opening at the center through which the hand set 15 may project if desired. This feature, however, .formsno part of the inventionv herein disclosed.

What I claim is:

1. In an alarm clock, an alarm bell, a hammer therefor, an adjustable switch adapted to render said alarm inoperative, means to secure said switch to the clock, and means integral with the case of the clock adjacent to said switch to hold the same in its operative path and to hold it in all positions of adjustment.4

2. In an alarm clock, an alarm bell, a hammer therefor, a switch adapted to render saidalarm inoperative and means integralA with the case of the clock and over-lying said switch to hold the same in its operativepath and to hold it in operative and moperative positions.

3. In an alarm clock, in an alarm bell, a hammer therefor, and switch arm pivoted at the center of the back of said clock and adapted to `render said alarm inoperative,

and means integral with said back and adfriction rib mounted adjacent to said switch jacent to the outer extremity of said switch to hold the 'same in all positions of adjust- 10 to protect the same against displacement ment.

from its operative path.

5 4. In an alarm clock, an alarm bell, a ham- FRANK R' ALFORD mer therefor, a switch adapted to render said Witnesses: alarm ino erative, means to secure said HARVEY L. SLAUsoN, switch to lille clock and a tongue having a Y SAMUEL A. WETMORE. 

